I’m sorry that she is not doing well. Would you be interested in learning how to tube or crop feed her? A piece of aquarium air tubing or oxygen tubing will fit to a 35 ml syringe from the feed store and can be used to tube feed thin liquid feed. Here is some info on tube feeding:
https://www.backyardchickens.com/th...ng-guide-pictures-under-construction.1064392/
https://www.backyardchickens.com/th...ng-guide-pictures-under-construction.1064392/